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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d039a965ffb3e07635d1a6658e20c8f66aabe1594b6db53aba99eab19719589' 
  AND token = 'gNeQ41G2Hl6k7YWaa3nj+XkJiuGG77fcLQem9dpA634=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}